Specifications for Utility Buildings
PART 1 – GENERAL
1.1 SCOPE
A. Construction and onsite placement of a prefabricated precast concrete utility building.
1.2 PERFORMANCE REQUIREMENTS
A. Manufacturer
1. Manufacturer shall be an NPCA Certified Plant or equal.
2. Manufacturer shall have a minimum of 5 years experience producing, assembling and finishing buildings.
B. Design requirements:
1. Building shall be designed per ASCE standard 7-05, “Minimum design loads for buildings and other structures”.
2. Seismic load performance category C. Exposure Group III
3. Standard Live Roof Load = 60.0 psf
4. Standard Floor Load = 250 psf
5. Standard Wind Loading = 130 mph
6. Concrete roof panels shall slope 1” from peak to the edge. The roof shall extend 2.5” beyond the wall panel on the outside edge of the building. The underside of the exterior overhang on the roof shall have a .5” drip edge cast into the concrete.
7. Plants for mixing concrete shall conform to ASTM C94.
8. Cement conforming to ASTM C150 or C595.
9. Concrete mixes proportioned using ACI 211.1
10. Coarse and Fine Aggregates conform to ASTM C33.
11. Mixing water conforms to ASTM C1602.
12. Chemical Admixtures used in concrete conform to ASTM C260(Air Entraining), C494(Mid and High range Water Reducers), C979(Color Pigments).
13. Compressive strength of Concrete minimum 5000psi at 28 days.
14. Maximum water/cement ratio of .45.
15. Reinforcing Bars- Deformed Billet Steel meets ASTM 615.
16. Steel Bar mats and Welded Wire Reinforcement meets ASTM A184, A185, A497.
17. Cold Weather Concrete
a. Cold weather concrete placement will be in accordance with ACI 306.
b. Concrete will not be placed if ambient temperature is expected to be below 35 degrees Fahrenheit during the curing period unless heat is readily available to maintain the surface temperature of the concrete at least 45 degrees Fahrenheit.
c. Materials containing frost or lumps of frozen materials will not be used.
18. Hot Weather Concrete
a. The temperature of the concrete will not exceed 90 degrees at the time of placement. When the ambient temperature reaches 90 degrees the concrete will be protected with moist covering.
1.3 SUBMITTALS
A. Manufacturer shall provide drawings and engineering upon request.
1.4 QUALITY ASSURANCE
A. Production shall be done in accordance with approved submittals.
B. Pre-pour and post pour checks shall be completed to insure proper dimensioning, component placement, rebar placement, and architectural finish.
C. Concrete batches shall be tested daily for:
1. Aggregate moisture
2. Air entrainment
3. Temperature
D. Yield test and compressive strength cylinders shall be taken at a minimum weekly.
PART 2 – PRODUCTS
2.1 MATERIALS
A. Doors and Frames
1. Shall comply with the Steel Door Institute “Recommended Specifications for “Standard Steel Doors and Frames” (SDI-100) and as herein specified. The doors shall be insulated 18 gauge galvanized metal with 16 gauge galvanized frames. Doors and frames shall include one coat of rust inhibitive primer and two finish coats of enamel paint.
B. Door hardware
1. Door Closer: Norton CLP7500T or equal.
3. Sweep: Reese 962C Anodized Clear Aluminum, Door Sweep Weatherstrip Nylon Brush Insert or equal.
4. Hinges: 3 Hinges. Ives 3-BB-1-HW-4.5x4.5-US26D-NRP or equal.
5. Lockset: Key-in-lever cylindrical locksets shall be Falcon T Series or equal and meet the following requirements:
a. All locks shall meet the new ANSI/BHMA A156.2, Series 4000, Grade 1 for key-in-lever locksets.
b. Locksets shall be UL Listed (3 hour A Label).
c. Locksets shall be provided standard with Pressure Release feature. When outside lever is locked, it is not rigid but will move freely without operating the latch bolt.
d. Lever trim shall have individual heavy-duty compression springs behind rose for lever return and to prevent lever sag. Trim shall be through-bolted with two (2) 10-32 screws coated with thread sealant to provide strength and resistance to loosening. Inner and outer trim shall “bottom out” to prevent door collapse. Roses shall be minimum of 3-1/2” diameter.
e. All lever designs shall be solid and meet the federal ADA and state disability requirements. Inside levers shall be attached by Allen-head set screw to prevent tampering or vandalism.
f. Locksets shall adjust to fit door thickness from 1-3/4” to 2-1/8”.
g. All Locksets shall be non-handed and not require field disassembly for re-handling.
h. Preparation for door must be non-handed.
i. Acceptable manufacturer: Falcon Lock T571PD DAN 626 98535 5164 or equal.
K. Sealers
1. Floor shall be sealed using a deep penetrating, high alkali resistant, low volatility product. Acceptable manufacturer: TK Products 290 or equal.
L. Caulks and Grout
1. All joints between precast panels shall be caulked using a durable, flexible polyurethane sealant. Acceptable manufacturer: Tremco Dymonic FC or equal.
2. Grouts shall comply with ASTM C-387 and ASTM C-928 R2 and contain no calcium chloride or other added chlorides that contribute to reinforcement steel corrosion. Grout shall not contain any gypsum based components.
2.2 FINISHES
A. Interior
1. Smooth trowel finish.
B. Exterior
1. To be determined by owner.
2. Roof shall be smooth trowel finish.
C. Paint
1. Interior
a. Wall panels shall be primed with a premium quality water based acrylic multipurpose bonding primer moisture and alkali resistant up to 13.0 pH. ICI Paints or equal. Finish coat shall be a high performance acrylic semi-gloss enamel. Acceptable manufacturer: Devoe High Performance Devflex Coating or equal.
2. Exterior
a. Roof shall be sealed with product listed in 2.1 K.
b. Wall panels shall be covered with a quality concrete stain. Acceptable manufacturer: H&C Concrete Stain Water Based or equal.
3. Doors
a. Metal surfaces both interior and exterior shall be covered using a high performance 100% acrylic satin enamel. Acceptable manufacturer: Hallman Lindsay Duratech 100% Acrylic Satin Enamel or equal.